1. College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, People's Republic of China.
2. College of Horticulture and Gardening, Hunan Agricultural University, Changsha, People's Republic of China.
3. Hunan Provincial Key Laboratory for Germplasm Innovation and Utilization of Crop, Changsha, People's Republic of China.
4. Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, People's Republic of China.